Fuel distribution installation 



CONTROL AND INSTRUMENTATION SYSTEMS 



Fathometer 



The echo-sounder used on the bathyscaph is an adapta- 

 tion of a small boat commercial Fathometer. It has a 

 depth capability of 200 fathoms, and the readout is on 

 electrosensitive paper. The Fathometer enables the pilot 

 of the craft to "see" the sea floor at some distance before 

 it becomes visible to the eye. Its usage is analogous to 

 the use of an altimeter by the pilot of an aircraft. The 

 only modification made to the unit was to its transducer. 

 The original transducer was unable to withstand the great 

 pressures of the depths, and the beamwidth was too wide. 



Ballast Quantity Indication 



This system allows the pilot of the bathyscaph to read 

 the approximate quantity of ballast in each ballast tub, in 



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